Hello,
No dear, generally mathematics is not necessary for taking admission in BCA course. You can take admission in BCA as arts or commerce student. But you have to study mathematics in your BCA course so remember that..
BCA is bachalor of computer application. It's three years degree course. You can learn here the computer languages, data structure, DBMS, numerics etc. It's very growing course in now days actually.
All the best.
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